Locking structure for PCS cabinet and high-voltage cabinet in energy storage box transformer substation

Abstract

The utility model discloses a locking structure for a PCS cabinet and a high-voltage cabinet in an energy storage box transformer substation, and the structure comprises a high-voltage cabinet side lock which comprises an AC power supply, a circuit breaker side open circuit display connected to one side of the AC power supply, and a PCS switch sub-position connected to one side of the circuit breaker side display. The system also comprises a pcs cabinet side lock, and the pcs cabinet side lock comprises a DC power supply. The utility model solves the problems that the existing energy storage box transformer substation and the PCS are responsible for different manufacturers, only a high-voltage cabinet and a PCS cabinet are independent single-cabinet five-prevention, the locking of the whole system is not considered, a sensor is installed in the PCS (converter) cabinet, a signal is connected to a high-voltage side live display, the structures of the existing PCS manufacturers are different, unified requirements cannot be made, and the cost is high. And the sensor voltage (690V) in the PCS is inconsistent with the sensor voltage (35kV) of a high-voltage cabinet, so that the scheme is difficult to implement and high in cost, and the problem that a high-voltage side grounding knife cannot be locked with the low-voltage side due to the fact that the low-voltage side of an existing energy storage box transformer substation scheme is not provided with a frame circuit breaker in the prior art is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of energy storage box transformers, in particular to a locking structure of a PCS cabinet and a high-voltage cabinet in an energy storage box transformer. Background Art

[0002] At present, the energy storage box transformer is a bidirectional conversion product. It can not only convert the DC power on the battery side into AC power through the converter and integrate it into the power grid, but also convert the AC power of the power grid into DC power through the converter to charge the battery. Therefore, the bidirectional current flow system needs to consider the five-protection locking measures of the entire system.

[0003] However, it still has the following disadvantages in actual use:

[0004] At present, the energy storage box transformer and PCS are produced by different manufacturers. Only the high-voltage cabinet and PCS cabinet have independent single cabinet five protections. The locking of the entire system is not considered. Sensors are installed in the PCS (converter) cabinet, and the signals are connected to the high-voltage side live display. At present, the structures of PCS manufacturers are different and it is impossible to make unified requirements. Moreover, the sensor voltage (690V) in the PCS is inconsistent with the sensor voltage (35kV) in the high-voltage cabinet. Therefore, this solution is difficult to implement and the cost is high. At present, there is no frame circuit breaker on the low-voltage side of the energy storage box transformer solution, and the high-voltage side ground knife cannot be locked with the low-voltage side.

[0005] Therefore, a new locking structure between the PCS cabinet and the high-voltage cabinet in the energy storage box transformer is proposed to solve the above problems. Utility Model Content

[0006] The purpose of the utility model is to provide a locking structure of the PCS cabinet and the high-voltage cabinet in the energy storage box transformer to solve the problem raised in the above-mentioned background technology that the energy storage box transformer and the PCS are currently the responsibility of different manufacturers, and only the high-voltage cabinet and the PCS cabinet have five independent single cabinets, and the locking of the entire system is not considered. A sensor is installed in the PCS (converter) cabinet, and the signal is connected to the high-voltage side live display. At present, the structures of PCS manufacturers are different and it is impossible to make unified requirements, and the sensor voltage (690V) in the PCS is inconsistent with the sensor voltage (35kV) of the high-voltage cabinet. Therefore, this solution is difficult to implement and the cost is high. At present, the low-voltage side of the energy storage box transformer solution has no frame circuit breaker, and the high-voltage side ground knife cannot be locked with the low-voltage side.

[0007] In order to solve the above technical problems, the utility model is realized by the following technical solutions:

[0008] The utility model is a locking structure of a PCS cabinet and a high-voltage cabinet in an energy storage box transformer, comprising:

[0009] The high-voltage cabinet side lock includes an AC power supply, a circuit breaker side circuit breaker display connected to one side of the AC power supply, a PCS switch position connected to one side of the circuit breaker side display, and a circuit breaker sensor connected to one side of the circuit breaker side circuit breaker display.

[0010] Furthermore, the high-voltage cabinet side lock also includes a first electromagnetic lock connected to one side of the PCS switch split position and a second electromagnetic lock connected to one side of the PCS switch split position.

[0011] Furthermore, the first electromagnetic lock and the second electromagnetic lock are connected in parallel, and the high-voltage cabinet power display circuit and the electromagnetic lock circuit need to receive the signal of the PCS switch position.

[0012] Furthermore, it also includes a PCS cabinet side lock, which includes a DC power supply, a manual switch connected to one side of the DC power supply, a bidirectional switch connected to the rear side of the manual switch, a current transformer connected to one side of the manual switch, a grounding switch connected to a line in the bidirectional switch, and a fast fuse connected to the rear side of the bidirectional switch.

[0013] Furthermore, the manual switch is divided into two lines, the bidirectional switch is divided into two lines, the current transformer is divided into two lines, and the grounding switch opening signal is led to the PCS cabinet.

[0014] Furthermore, on the battery side, the DC power supply is converted into AC power supply through the inverter and connected to the power grid. The inverter side is the power supply side, and the PCS switch position signal in the inverter is connected to the ground knife electromagnetic lock circuit. Only when the inverter switch is in the open position and the ground knife electromagnetic lock is energized can the electromagnetic lock of the high-voltage cabinet be opened.

[0015] Compared with the prior art, the advantages of the present invention are:

[0016] The utility model solves the problem that the energy storage box transforms the high-voltage cabinet and the PCS cabinet into independent ones by setting the high-voltage cabinet side lock and the PCS cabinet side lock. The secondary interconnection between the high-voltage cabinet and the PCS cabinet is realized through this locking form, thereby improving the safety of the operation of the entire energy storage system and preventing misoperation. At the same time, through the existing standard devices, without adding components, the perfect five-protection function is realized through electrical locking, thereby finally realizing the safety of system operation without increasing investment.

[0017] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for describing the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 This is a schematic diagram of the side locking of the high-voltage cabinet of the utility model;

[0020] Figure 2 This is a schematic diagram of the PCS cabinet side locking of the utility model.

[0021] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0022] 101, AC power supply; 102, circuit breaker side circuit breaker display; 103, PCS switch position; 104, first electromagnetic lock; 105, second electromagnetic lock; 106, circuit breaker side sensor;

[0023] 201, DC power supply; 202, manual switch; 203, bidirectional switch; 204, current transformer; 205, grounding switch; 206, fast fuse; 207, grounding switch trip signal. DETAILED DESCRIPTION

[0024] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below with reference to the accompanying drawings.

[0025] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific implementation methods disclosed below.

[0026] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the implementation of the present invention, for the sake of convenience, the cross-sectional diagram showing the device structure will not be partially enlarged according to the general scale, and the schematic diagram is only an example, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0027] In order to make the purpose, technical solution and advantages of the present invention more clear, the implementation mode of the present invention will be further described in detail below with reference to the accompanying drawings.

[0028] See also Figure 1-Figure 2 As shown, this embodiment is a locking structure of the PCS cabinet and the high-voltage cabinet in the energy storage box transformer, including:

[0029] The high-voltage cabinet side lock includes an AC power supply 101, a circuit breaker side disconnection indicator 102 connected to one side of the AC power supply 101, a PCS switch position 103 connected to one side of the circuit breaker side display 102, a circuit breaker sensor 106 connected to one side of the circuit breaker side disconnection indicator 102, a first electromagnetic lock 104 connected to one side of the PCS switch position 103, and a second electromagnetic lock 105 connected to one side of the PCS switch position 103;

[0030] The high-voltage cabinet side is the power supply side. The lower door of the high-voltage cabinet can be locked through the circuit breaker side sensor, live display and ground knife electromagnetic lock to prevent accidental entry into the live compartment; the PCS cabinet switch closing circuit is connected to the SMLD MLD input high-voltage ground knife position signal. The high-voltage side ground knife is open, and the PCS switch can be closed to achieve PCS cabinet side locking;

[0031] The first electromagnetic lock 104 and the second electromagnetic lock 105 are connected in parallel, and the high-voltage cabinet power display circuit and the electromagnetic lock circuit need to receive the signal of the PCS switch position 103;

[0032] It also includes a PCS cabinet side lock, which includes a DC power supply 201, a manual switch 202 connected to one side of the DC power supply 201, a bidirectional switch 203 connected to the rear side of the manual switch 202, a current transformer 204 connected to one side of the manual switch 202, a grounding switch 205 connected to a line in the bidirectional switch 203, and a fast fuse 206 connected to the rear side of the bidirectional switch 203;

[0033] When the DC power on the battery side is converted into AC power by the converter and connected to the power grid, the converter side is the power supply side. The switch position signal in the converter is connected to the electromagnetic lock circuit of the ground knife. Only when the converter switch is in the open position and the electromagnetic lock of the ground knife is energized can the electromagnetic lock of the high-voltage cabinet be opened to achieve the five-protection requirements. The PCS cabinet switch closing circuit is connected to the position signal of the high-voltage ground knife. The high-voltage side ground knife is open, and the PCS switch can be closed to achieve the locking of the PCS cabinet side.

[0034] The manual switch 202 is divided into two lines, the bidirectional switch 203 is divided into two lines, the current transformer 204 is divided into two lines, and the grounding switch opening signal 207 is led to the PCS cabinet;

[0035] On the battery side, the DC power supply 201 is converted into AC power supply 101 by the converter and connected to the power grid. The converter side is the power supply side. The PCS switch position 103 signal in the converter is connected to the ground knife electromagnetic lock circuit. Only when the converter switch is in the position and the ground knife electromagnetic lock is energized can the electromagnetic lock of the high-voltage cabinet be opened.

[0036] Working principle:

[0037] First, the high-voltage cabinet live display circuit and electromagnetic lock circuit need to be connected to the position signal of the main switch on the PCS cabinet side. Two secondary wires are connected from the PCS cabinet terminal block to the high-voltage cabinet terminal block. The normally closed point of the main switch of the PCS cabinet is connected.

[0038] Next, the high-voltage cabinet ground switch position signal needs to be connected to the PCS cabinet main switch closing circuit. Two secondary wires are connected from the high-voltage cabinet terminal block to the PCS cabinet terminal block. The normally closed point of the high-voltage cabinet ground switch is connected.

[0039] Secondly, the normally closed points and closing circuits of the main switch of the PCS cabinet need to leave nodes in the cabinet terminal block.

[0040] In addition, nodes need to be reserved on the cabinet terminal block for the normally closed points of the high-voltage cabinet ground switch and the electromagnetic lock circuit.

[0041] In this way, the energy storage box transformer manufacturer will connect the corresponding signals and conduct debugging.

[0042] After the energy storage box transformer shipped out of the factory in this step is connected to the system, the entire system has complete five protections, ensuring the safety and stability of the system without the problem of misoperation.

[0043] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0044] Finally, it should be noted that the above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. The locking structure of the PCS cabinet and the high-voltage cabinet in the energy storage box transformer is characterized by: include: A high-voltage cabinet side lockout includes an AC power supply (101), a circuit breaker side disconnection indicator (102) connected to one side of the AC power supply (101), a PCS switch position (103) connected to one side of the circuit breaker side disconnection indicator (102), and a circuit breaker sensor (106) connected to one side of the circuit breaker side disconnection indicator (102).

2. The locking structure of the PCS cabinet and the high-voltage cabinet in the energy storage box transformer according to claim 1 is characterized in that: The high-voltage cabinet side lock also includes a first electromagnetic lock (104) connected to one side of the PCS switch position (103) and a second electromagnetic lock (105) connected to one side of the PCS switch position (103).

3. The locking structure of the PCS cabinet and the high-voltage cabinet in the energy storage box transformer according to claim 2 is characterized in that: The first electromagnetic lock (104) and the second electromagnetic lock (105) are connected in parallel, and the high-voltage cabinet power display circuit and the electromagnetic lock circuit need to be connected to the signal of the PCS switch position (103).

4. The locking structure of the PCS cabinet and the high-voltage cabinet in the energy storage box transformer according to claim 1 is characterized in that: The invention also includes a PCS cabinet side lock, wherein the PCS cabinet side lock includes a DC power supply (201), a manual switch (202) connected to one side of the DC power supply (201), a bidirectional switch (203) connected to the rear side of the manual switch (202), a current transformer (204) connected to one side of the manual switch (202), a grounding switch (205) connected to a line in the bidirectional switch (203), and a fast fuse (206) connected to the rear side of the bidirectional switch (203).

5. The locking structure of the PCS cabinet and the high-voltage cabinet in the energy storage box transformer according to claim 4 is characterized in that: The manual switch (202) is divided into two lines, the bidirectional switch (203) is divided into two lines, the current transformer (204) is divided into two lines, and the grounding switch opening signal (207) is led to the PCS cabinet.

6. The locking structure of the PCS cabinet and the high-voltage cabinet in the energy storage box transformer according to claim 3 is characterized in that: On the battery side, the DC power supply (201) is converted into an AC power supply (101) by a converter and connected to the power grid. The converter side is the power supply side. The PCS switch position (103) signal in the converter is connected to the grounding electromagnetic lock circuit. Only when the converter switch is in the position and the grounding electromagnetic lock is energized can the electromagnetic lock of the high-voltage cabinet be opened.

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